When I was younger and my bipolar was just getting started ( I was just having depressive episodes and hypomania, no real mania) I had longer periods of normalcy, like up to 8 months I would guess, but now 10 years later I have almost no normal time. I had one good semester when I felt like I was really on top of things in my life during my undergraduate degree, but I have suspicions that I was hypomanic at the time. Other than that I just jump back and forth between painfully long agitated depressions (like a year and a half) and short manias (like 2-3 weeks).